Automatic deletion of content in MS Word file while the file is being viewed!!

Something strange in my neighborhood!!
OS WindowsXP-SP2. Enabled = Norton AV + XP Firewall + Adaware + Spybot. Allowed = 1st Party cookies only on prompt & session cookies.
Copy pasted a page from the net in MS Word. Refered to the text document a couple of times. At the final viewing the text automatically on its own started to delete itself (left to right!) until the complete document went blank? A search after this with Ad+spyware & NAV brought out just one tracking cookie.
Have I caught something I'd rather not have? Or am I my own bogeyman? Please advise.

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